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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9995173976762e5e56dac37127b09c41dc35bdc72dd63a39e8b2e1d8b6277e' 
  AND token = 't/VVXUXdslatavZ5brRJlB3ZYyEoteF2ubrGyl687gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}